Xena or Callisto? Which one?

Dreams worst torture,
Past problems to life.
Minds melting into one,
Bodies switching to reality.
Best friend lost in thought,
One mind trying to convince her.
Gabrielle use anger to kill,
Is what Callisto wants and desires.
Xena trapped in another body,
Callisto taking adantage of Xena's.
Trying to prove that she,
Is not the evil one of the two.
Eventually Xena wins the first battle,
But not the war.
She returns to reality,
But not in her Xena form.
So wait until the battle,
Where one will truly die.
Xena versus Callisto,
The battle for their lives.